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SCHEDULE 13D/A Filed 2026-06-23 Event 2026-06-18 SEC 0001104659-26-076853 →

Fairmount Funds Management LLC Apogee Therapeutics, Inc. APGE

Stake: 9.99% Shares: 6,713,519 CUSIP: 03770N101 Class: Common Stock, $0.00001 par value

Item 4 — Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: Merger Agreement and Voting Agreement On June 18, 2026, Andor LLC ("Parent"), a Delaware limited liability company and a wholly owned subsidiary of AbbVie Inc. ("Guarantor"), Andor Merger Co. ("Merger Sub"), a Delaware corporation and a wholly owned subsidiary of Parent, the Company and Guarantor (solely for limited purposes) entered into an Agreement and Plan of Merger (the "Merger Agreement"), pursuant to which Merger Sub will merge with and into the Company (the "Merger"), with the Company surviving the Merger as a wholly owned subsidiary of Parent. Pursuant to the Merger Agreement, at the effective time of the Merger (the "Effective Time"), each share of Common Stock issued and outstanding immediately prior to the effective time of the Merger (other than certain excluded shares) will be cancelled and converted into the right to receive $135.11 per Share in cash, without interest (the "Merger Consideration"). The consummation of the Merger is subject to customary conditions, including (a) the affirmative vote of the holders of a majority of the outstanding shares of Common Stock, par value $0.00001 per share the ("Required Company Voting Stockholder Approval"), and (b) for so long as at least 6,061,821 shares of Non-Voting Common Stock, par value $0.00001 per share remain issued and outstanding, the affirmative vote or written consent of the holders of a majority of the outstanding shares of Non-Voting Common Stock, (the "Required Non-Voting Stockholder Approval", together with the Required Company Voting Stockholder Approval, the "Required Company Stockholder Approvals"). Concurrently with the execution of the Merger Agreement, on June 18, 2026, Fund II entered into a Voting Agreement (the "Voting Agreement") with Guarantor, Parent and Merger Sub. Pursuant to the Voting Agreement, Fund II agreed, among other things, to: (a) vote (or cause to be voted) all of its Subject Shares (as defined in the Voting Agreement) (i) in favor of (A) the adoption of the Merger Agreement and approval of the Merger, (B) any proposal to adjourn or postpone any meeting of stockholders at which the Merger Agreement is submitted for approval, (C) any other proposal necessary for consummation of the Merger, and (ii) against (A) any alternative acquisition transaction, (B) any action that would result in a breach of the Company's obligations under the Merger Agreement, (C) any change in the membership of the Company's board of directors not recommended by the Company's board, and (D) any other action intended or expected to impede the Merger; (b) grant an irrevocable proxy to Parent as attorney-in-fact in the event Fund II fails to deliver a proxy card at least two (2) business days prior to the applicable meeting of stockholders; (c) not Transfer (as defined in the Voting Agreement) any Subject Shares, create any encumbrances on the Subject Shares, enter into any derivative arrangement with respect to the Subject Shares, grant any proxy or power-of-attorney with respect to the Subject Shares, deposit the Subject Shares into a voting trust, or take any other action that would reasonably be expected to prevent Fund II from performing its obligations under the Voting Agreement, subject to limited exceptions for Transfers to controlled Affiliates (provided such transferees execute a counterpart of the Voting Agreement); (d) not take any actions the Company is prohibited from taking under Section 5.3(a) of the Merger Agreement (relating to non-solicitation of alternative transactions); and (e) waive any appraisal or dissenters' rights (including under Section 262 of the DGCL) with respect to the Subject Shares in connection with the Merger. The Voting Agreement terminates automatically upon the first to occur of: (a) the valid termination of the Merger Agreement in accordance with its terms; (b) the Effective Time; (c) receipt of the Required Company Stockholder Approvals; (d) the End Date (as defined in the Voting Agreement); (e) any modification or amendment to the Merger Agreement that reduces the amount, changes the form or otherwise adversely affects the Merger Consideration; or (f) the mutual written consent of all parties thereto. In addition, concurrently with the execution of the Merger Agreement, Fund II delivered a written consent (the "Written Consent") approving the Merger for purposes of Section 4.2(b) of the Company's Certificate of Incorporation, which requires approval from the holders of a majority of the outstanding Non-Voting Common Stock for certain fundamental transactions. The foregoing descriptions of the Merger Agreement and the Voting Agreement do not purport to be complete and are qualified in their entirety by reference to the full text of the Merger Agreement and the Voting Agreement. The Voting Agreement is filed as Exhibit 99.2 to this Amendment No. 6 and is incorporated herein by reference. On Jun

Cross-References

Insider Activity (last 365d)
10 transactions
1 buys · 7 sales · 2 awards/exercises
Issuer Cluster
4 13D/G filings on this issuer
3 other filings besides this one
Filer Track Record
18 filings by this filer
17 other filings in the data moat
Short Interest · settle 2026-07-15
DTC 2.37
4,133,296 shares short · -19.9% vs prior

Post-Filing Returns · since 2026-06-18 on APGE

+1 day
+46.7%
+5 days
+47.0%
+30 days
+48.4%
+60 days
+90 days
+180 days

Anchor price 90.38 on closest trading day on/after 2026-06-18. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-07-14 Dambkowski Carl officer Gift 8,000
2026-07-10 HENDERSON MICHAEL THOMAS director, officer Gift 75,046
2026-07-08 HENDERSON MICHAEL THOMAS director, officer Sale 20,000 $133.63 $2.67M
2026-06-09 Bollinger Lisa director Award 7,657 $85.00 $651K
2026-05-01 Henderson Jane officer Sale 811 $81.02 $66K
2026-05-01 Henderson Jane officer Sale 900 $82.60 $74K
2026-05-01 Henderson Jane officer Sale 289 $83.16 $24K
2026-04-08 HENDERSON MICHAEL THOMAS director, officer Sale 17,800 $82.48 $1.47M
2026-04-08 HENDERSON MICHAEL THOMAS director, officer Sale 2,000 $83.26 $167K
2026-04-08 HENDERSON MICHAEL THOMAS director, officer Sale 200 $85.00 $17K

Other 13D/G Filings on Apogee Therapeutics, Inc.

FiledFormFilerStakeShares
2026-01-22 SCHEDULE Fairmount Funds Management LLC 9.99% 6,047,027 view →
2025-10-14 SCHEDULE Fairmount Funds Management LLC 9.99% 5,776,881 view →
2024-04-01 SC Fairmount Funds Management LLC view →

Other Filings by Fairmount Funds Management LLC

FiledFormIssuerStakeShares
2026-07-20 SCHEDULE 13D/A Crescent Biopharma, Inc. 6,593,385 view →
2026-07-01 SCHEDULE 13D/A ORUKA THERAPEUTICS, INC. ORKA 19.50% 14,553,895 view →
2026-06-23 SCHEDULE 13D/A SPYRE THERAPEUTICS, INC. SYRE 8,835,440 view →
2026-06-09 SCHEDULE 13D/A Jade Biosciences, Inc. JBIO 19.99% 14,069,494 view →
2026-05-13 SCHEDULE 13D/A Viridian Therapeutics, Inc.\DE VRDN 17,201,800 view →
2026-01-22 SCHEDULE Apogee Therapeutics, Inc. APGE 9.99% 6,047,027 view →
2026-01-22 SCHEDULE Cogent Biosciences, Inc. COGT 9.90% 16,261,918 view →
2025-10-14 SCHEDULE Apogee Therapeutics, Inc. APGE 9.99% 5,776,881 view →
2025-09-15 SCHEDULE Dianthus Therapeutics, Inc. /DE/ DNTH 9.90% 4,052,052 view →
2025-03-10 SCHEDULE Oruka Therapeutics, Inc. ORKA 19.99% 8,511,824 view →
2024-04-01 SC Dianthus Therapeutics, Inc. /DE/ DNTH view →
2024-04-01 SC Viridian Therapeutics, Inc.\DE VRDN view →
2024-04-01 SC Apogee Therapeutics, Inc. APGE view →
2024-04-01 SC Cogent Biosciences, Inc. COGT view →
2023-12-11 SC Spyre Therapeutics, Inc. SYRE view →
2023-06-13 SC Cogent Biosciences, Inc. COGT view →
2021-09-23 SC Viridian Therapeutics, Inc.\DE VRDN view →

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